245540521 has 2 divisors, whose sum is σ = 245540522. Its totient is φ = 245540520.

The previous prime is 245540509. The next prime is 245540531. The reversal of 245540521 is 125045542.

245540521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217238121 + 28302400 = 14739^2 + 5320^2 .

It is a cyclic number.

It is not a de Polignac number, because 245540521 - 2¹⁵ = 245507753 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245540521.

It is not a weakly prime, because it can be changed into another prime (245540531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122770260 + 122770261.

It is an arithmetic number, because the mean of its divisors is an integer number (122770261).

Almost surely, 2^245540521 is an apocalyptic number.

It is an amenable number.

245540521 is a deficient number, since it is larger than the sum of its proper divisors (1).

245540521 is an equidigital number, since it uses as much as digits as its factorization.

245540521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 245540521 is about 15669.7326397102. The cubic root of 245540521 is about 626.1923019394.

The spelling of 245540521 in words is "two hundred forty-five million, five hundred forty thousand, five hundred twenty-one".